App Dev Worksheet: Variables, Lists and Saving

App development lesson 15: Data: variables, lists and saving · Set 764 · 40 questions

Developer's tip (Box, list, place): A variable holds one value; a list holds many in order. Positions start at 0. push adds to the end; pop takes off the last item; length is how many items. On the phone: works offline, private. In the cloud: shared, any device, needs the internet.

1. 1.💾 Where should the app save notes to read offline: on the phone or in the cloud? (a) in the cloud (b) on the phone
2. 2.True or false: notes to read offline fits saving on the phone. (a) False (b) True
3. 3.💾 What is a variable? (a) a named box for a value (b) a phone setting (c) a type of screen (d) a picture
4. 4.Which of these fits saving in the cloud? (a) a draft you are typing (b) notes to read offline (c) the sound on/off setting (d) photos on two devices
5. 5.💾 What number does this code show?
   let friends = ["Kabir", "Arjun", "Zoya", "Meera"];
   friends.push("Aman");
   show(friends.length);
6. 6.💾 What number does this code show?
   let friends = ["Riya", "Kabir", "Zoya", "Meera"];
   friends.push("Aman");
   friends.push("Arjun");
   show(friends.length);
7. 7.💾 Data saved only on the phone is lost when ___. (a) the phone is lost (b) the app is closed (c) you send a message (d) the screen turns off
8. 8.Which of these fits saving on the phone? (a) a shared to-do list (b) chat messages to friends (c) photos on two devices (d) notes to read offline
9. 9.💾 What number does this code show?
   let notes = ["Art", "Hindi", "Sports"];
   notes.push("Maths");
   notes.push("Science");
   show(notes.length);
10. 10.💾 Where should the app save a draft you are typing: on the phone or in the cloud? (a) on the phone (b) in the cloud
11. 11.💾 Where should the app save chat messages to friends: on the phone or in the cloud? (a) in the cloud (b) on the phone
12. 12.💾 Where should the app save photos on two devices: on the phone or in the cloud? (a) in the cloud (b) on the phone
13. 13.True or false: a draft you are typing fits saving on the phone. (a) True (b) False
14. 14.True or false: chat messages to friends fits saving on the phone. (a) True (b) False
15. 15.💾 What number does this code show?
    let notes = ["Art", "Sports", "Hindi"];
    notes.push("Maths");
    notes.push("Music");
    show(notes.length);
16. 16.Which of these fits saving on the phone? (a) a shared to-do list (b) a class leaderboard (c) photos on two devices (d) a draft you are typing
17. 17.💾 What number does this code show?
    let points = 6;
    points = points - 2;
    points = points + 2;
    show(points);
18. 18.💾 What number does this code show?
    let notes = ["Hindi", "Music"];
    notes.push("Sports");
    show(notes.length);
19. 19.💾 What number does this code show?
    let notes = ["Music", "Maths", "Sports", "Science"];
    notes.push("Art");
    show(notes.length);
20. 20.True or false: a shared to-do list fits saving in the cloud. (a) False (b) True
21. 21.💾 What does this code show? (Positions start at 0.)
    let friends = ["Aman", "Kabir", "Meera"];
    show(friends[1]); (a) Aman (b) Kabir (c) Meera
22. 22.💾 What number does this code show?
    let friends = ["Zoya", "Riya", "Kabir", "Arjun"];
    friends.push("Aman");
    friends.push("Meera");
    show(friends.length);
23. 23.💾 Which can hold many values in order? (a) a switch (b) a single number (c) a list (d) a button
24. 24.Which of these fits saving in the cloud? (a) your last game level (b) the sound on/off setting (c) a class leaderboard (d) notes to read offline
25. 25.💾 What number does this code show?
    let friends = ["Riya", "Aman", "Zoya", "Meera"];
    friends.push("Kabir");
    show(friends.length);
26. 26.💾 Saving data in the cloud lets you ___. (a) shrink the app (b) never need a password (c) use it on any device (d) skip the internet
27. 27.True or false: photos on two devices fits saving on the phone. (a) True (b) False
28. 28.True or false: photos on two devices fits saving in the cloud. (a) False (b) True
29. 29.💾 pop() takes off the last item. What does this code show?
    let songs = ["Sunrise", "Stars", "Kites", "Monsoon", "Ocean"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Monsoon (b) Sunrise (c) Stars (d) Kites
30. 30.💾 What does this code show? (Positions start at 0.)
    let friends = ["Aman", "Arjun", "Riya"];
    show(friends[0]); (a) Aman (b) Arjun (c) Riya
31. 31.💾 What number does this code show?
    let notes = ["Hindi", "Maths"];
    notes.push("Music");
    notes.push("Science");
    show(notes.length);
32. 32.💾 What number does this code show?
    let score = 9;
    score = score - 9;
    score = score + 2;
    show(score);
33. 33.💾 What number does this code show?
    let lives = 9;
    lives = lives - 8;
    lives = lives + 2;
    show(lives);
34. 34.💾 pop() takes off the last item. What does this code show?
    let songs = ["Kites", "Sunrise", "Rain", "Ocean"];
    songs.pop();
    show(songs[songs.length - 1]); (a) Sunrise (b) Kites (c) Rain (d) Ocean
35. 35.💾 pop() takes off the last item. What does this code show?
    let notes = ["Art", "Sports", "Hindi"];
    notes.pop();
    show(notes[notes.length - 1]); (a) Sports (b) Hindi (c) Art
36. 36.💾 Where should the app save the sound on/off setting: on the phone or in the cloud? (a) in the cloud (b) on the phone
37. 37.💾 What number does this code show?
    let friends = ["Kabir", "Arjun", "Riya"];
    friends.push("Meera");
    friends.push("Aman");
    show(friends.length);
38. 38.💾 Where should the app save your last game level: on the phone or in the cloud? (a) in the cloud (b) on the phone
39. 39.💾 What number does this code show?
    let lives = 7;
    lives = lives - 4;
    lives = lives + 5;
    show(lives);
40. 40.💾 What number does this code show?
    let coins = 6;
    coins = coins - 4;
    coins = coins + 3;
    show(coins);

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